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AN3392

STEVAL-ISV009V1 application diagram

Doc ID 018749 Rev 1

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Appendix A

STEVAL-ISV009V1 application diagram

The following figure shows how to connect the STEVAL-ISV009V1 to a photovoltaic panel.

Figure 27.

STEVAL-ISV009V1 application schematic

It is possible to utilize a PV string by connecting the output stages of the SPV1020 in series

to guarantee the voltage level required by the specific application.

Maximum voltage for the STEVAL-ISV009v1 is 36 V, according to R3/R4 partitioning.

For example, if the application requires 400 V (Vout_tot) then the minimum number of

STEVAL-ISV009V1 to be connected in series (Ns_min) is:

Equation 27

In order to guarantee the performance of the whole PV string (e.g. in the case of shaded

panels), a minimum redundancy (10%) on Ns_min is suggested.

Furthermore, considering that the SPV1020 is a voltage boost converter, it is required that

the maximum input voltage (Vo of each PV panel) must be lower than its output voltage. So

the maximum number of devices in series is also limited by the following rule:

Equation 28

_min

out_tot

out_max

-----------------------

400

----------

≥

Ns_max

out_tot

-------------------

≤

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